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Fencer Vulns
high 7.5

CVE-2018-16855 in the critical feed json

An issue has been found in PowerDNS Recursor before version 4.1.8 where a remote attacker sending a DNS query can trigger an out-of-bounds…

published 2018-12-03 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8648

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
58.6%
EPSS 58.6% chance of exploitation in 30 days, percentile 99.1%
public exploits
0
none known

Summary

An issue has been found in PowerDNS Recursor before version 4.1.8 where a remote attacker sending a DNS query can trigger an out-of-bounds memory read while computing the hash of the query for a packet cache lookup, possibly leading to a crash.

Patch / fix

  • powerdns recursor 4.1.8
  • pdns-recursor Debian 14, Debian 13, Debian 12 4.1.8-1

debian advisories DEBIAN-CVE-2018-16855

  • pdns-recursor openSUSE Tumbleweed 4.5.5-1.3
  • pdns-recursor Package Hub 15 4.1.2-bp150.2.3.1
  • pdns-recursor Package Hub 12 SP1 4.1.8-13.1

opensuse advisories openSUSE-SU-2024:11157-1openSUSE-SU-2018:4177-1openSUSE-SU-2018:4062-1

  • pdns-recursor Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 4.1.8-r0

alpine advisories ALPINE-CVE-2018-16855

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • powerdns-recursor Arch Linux 4.1.8-1

arch linux advisories AVG-821

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-16855 updated cvss 7.5

pdns-recursor: Out-of-bounds read with crafted DNS queries

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

58.58% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • [UNKNOWN] pdns-recursor

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.